Visualization of internal structure and internal stress in visibly opaque objects using full-field phase-shifting terahertz digital holography
| Autor: | Yasuhiro Mizutani, Fui Minamiji, Takeshi Yasui, Hidenori Koresawa, Hirotsugu Yamamoto, Takahiko Mizuno, Tetsuo Iwata, Ryo Oe, Takeo Minamikawa, Masatomo Yamagiwa, Yu Tokizane |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Opacity business.industry Terahertz radiation Digital imaging 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics law.invention Visualization 010309 optics Amplitude Optics law 0103 physical sciences 0210 nano-technology business Quantum cascade laser Image resolution Digital holography |
| Zdroj: | Optics Express. 27(23):33854-33868 |
| ISSN: | 1094-4087 |
| Popis: | We construct a full-field phase-shifting terahertz digital holography (PS-THz-DH) system by use of a THz quantum cascade laser and an uncooled, 2D micro-bolometer array. The PS-THz-DH enables us to separate the necessary diffraction-order image from unnecessary diffraction-order images without the need for spatial Fourier filtering, leading to suppress the decrease of spatial resolution. 3D shape of a visibly opaque object is visualized with a sub-millimeter lateral resolution and a sub-µm axial resolution. Also, the digital focusing of amplitude image enables the visualization of internal structure with the millimeter-order axial selectivity. Furthermore, the internal stress distribution of an externally compressed object is visualized from the phase image. The demonstrated results imply a possibility for non-destructive inspection of visibly opaque non-metal materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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